print("helloworld")
import keyword

print(keyword.kwlist)

a = 10
print(a)
print(type(a))

# type  获取变量类型

# 动态数据类型语言
a = "数加"
print(a)
print(type(a))

# 通过大小标记常量
PI = 3.1415926

# 单行注释

'''
多行注释
'''
"""
多行注释
"""

print("数加'学院")
print('数加"学院')
print('数加\n学院')
print('数加\t学院')
print(r'数加\t学院')

print("数加" == "数加")

s = "数加"

# isinstance  判断数据类型
print(isinstance(s, str))

print(type(PI))

print(True & False)

print("=" * 100)

print(type(None))

a = 10
b = 3

print(a + b)
print(a - b)
print(a / b)
print(a * b)
print(a // b)
print(a % b)
print(a ** b)  # a的b次方

a = "3.14"

# 类型转换
print(float(a))
#print(int(a))
print("=====")
